Outsystems 5.1 / SSL / SMTP Problem

Outsystems 5.1 / SSL / SMTP Problem

Our client has an Outsystems 5.1 infrastructure, and recently acquired and installed a Certificate on the Production Server, to allow secure outside access to their Outsystems Applications.

One of the features developed was the ability for sending automatic notifications by email, using one of the Client's SMTP Servers. Problem is, after the certificate was installed, the sending of those email messages stopped working, returning the following error:

Did you turn off http connections completly to force the https? It's required to allow http in local connections (127.0.0.1:80).
If that is not your problem, try checking your IIS logs to see what request is actually returning the 403.